A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable Home Addition Contractor Across Loomis
A home addition in Loomis means adding square footage to a home on a large lot, often with a well, a septic system, and Placer County rules attached. We’re Sutton ADU Sacramento, and we handle room additions, bathroom additions, bedroom additions, and second-story work across Loomis with a written price before any tool is lifted. Call us at (279) 300-1690 and you’ll get a real person, a straight answer, and a schedule for your free estimate.
Loomis is different from the flat suburban grids around it. Properties off King Road, along Horseshoe Bar Road, and up into the Penryn side of town sit on septic leach fields, private wells, and oak-studded slopes that change how an addition gets placed and priced. We plan for that from the first site visit, not after the county stops the job.
Why Sutton ADU Sacramento Is Loomis’s Preferred Home Addition Contractor Company
Most Home Addition Contractor teams will give you an estimate on the first visit and a different bill after demolition. We won’t. Every Loomis project starts with a written price, before work begins, and that price includes an allowance system for the surprises older homes tend to hide. When our crew opens a wall and finds something the county will require us to fix, we stop, document it, and get your written approval before spending a dollar of your money.
Our Loomis customers see the same thing on every visit: a background-checked, identity-verified technician whose name and photo were sent to you before arrival. That’s the Threshold Standard, and it’s the reason a homeowner who’s often home alone or has young kids can open the door without guessing who’s on the other side. Miles Hartwell runs our operation, and he’s built the crew around that standard since 2006.
We also understand what a Loomis Room Addition Contractor actually triggers. A 1980s ranch on a septic system isn’t the same job as a 2000s tract home in Rocklin. We quote for the code upgrades, the septic evaluation, and the well setback review up front, because we’ve seen what happens when a builder skips them. County stop-work orders are expensive, and they’re avoidable.
Bathroom Addition Contractor in Loomis
A Bathroom Addition Contractor in Loomis handles more than tile and fixtures. We’re adding a wet room to a home that may be on a septic system, which means the county’s Environmental Health department needs to confirm the leach field can handle the added load before you pull the permit. A ground-floor bathroom addition off a primary bedroom in Loomis typically runs $45,000 to $85,000, depending on whether we’re extending plumbing from an existing wall or running new lines under a slab.
Septic capacity and placement
Adding a bathroom means more water into the system. Placer County will require a septic system capacity evaluation if the existing system was designed for fewer bedrooms. We order that evaluation early, because its result can move the whole addition a few feet or change the size of the leach field upgrade you’ll need.
Well setback compliance
Your bathroom addition may need to stay a certain distance from your well and from any septic components. Loomis lots vary, and a bathroom that looks perfectly placed on a sketch may sit too close to a well head once the surveyor marks it. We check setbacks before we quote framing numbers, so the price you see is the price you build.
Bedroom Addition Contractor in Loomis
A Bedroom Addition Contractor in Loomis is doing more than framing walls and hanging drywall. In an unincorporated part of Placer County, a new bedroom changes your home’s official bedroom count, which changes your septic permit status, which can require a full Environmental Health review. A 12×14 bedroom addition in Loomis typically runs $70,000 to $120,000 before site work, and the number moves based on what’s behind the walls we’re tying into.
Code triggers in older homes
When we open a 1980s wall in Loomis to tie in a new bedroom, the county requires us to bring the affected area up to current code. That can mean arc-fault circuit breakers on the bedroom circuits, hardwired smoke and CO detectors with interconnected wiring, and shear wall reinforcement on exterior walls. We write these into the contract as a pre-priced allowance, not a surprise change order after demo day.
Foundation and drainage on Loomis soil
Loomis sits on clay-rich soils that expand and contract with the wet winter and dry summer. A bedroom addition needs a foundation design and drainage detail that won’t move or trap water against the new stem wall. On sloped lots, we add swales and downspout extensions as part of the base scope, because we know what happens the first rainy season if they’re skipped.
Trusted Brands We Service in Loomis
We work with prefab and modular ADU brands including Cover, Dvele, and Mighty Buildings, and we’ve installed them on Loomis lots that needed septic-compatible placement and fire-resistant exterior detailing. If you’re weighing a prefab bedroom addition against a stick-built one, we’ll give you an honest comparison of cost, timeline, and what each product line needs from your specific lot. We stock common trim, cladding, and flashing materials locally so Loomis projects don’t stall over a two-week parts order from out of state.
Common Home Addition Contractor Problems We See in Loomis Homes
- Septic capacity surprises: A homeowner assumes adding a bedroom is just framing and drywall, then Placer County asks for a septic capacity evaluation that forces a leach field expansion. We run the evaluation first and price it into the contract allowance.
- 1980s framing and wiring: Homes built between the 1970s and 1990s in Loomis often have ungrounded wiring, undersized headers, or missing shear panels that the county flags once walls are open. We inspect before quoting and write those code fixes into the allowance.
- Deck ledger and sill plate rot: A failed deck ledger or a poorly flashed transition can rot the sill plate where an addition ties into the main structure. We’ve seen it on homes off King Road and Horseshoe Bar Road, and we repair it before framing continues.
- Drainage failures on clay soil: Loomis’s expansive clay and sloped lots punish standard suburban drainage details. Without proper grading and positive drainage away from the new foundation, the first wet winter brings water intrusion and movement. We include drainage in the base scope, not as an add-on.
Pricing for Home Addition Contractor in Loomis, CA
Bathroom additions in Loomis run $45,000 to $85,000. Bedroom additions run $70,000 to $120,000. Room additions that tie in a large living space or great-room extension run $90,000 to $180,000. A second-story addition, which usually means an engineered review of the existing foundation and first-floor framing, starts around $150,000 and moves from there. What changes the number most in Loomis is the septic review, the well setback survey, and the condition of the walls we’re tying into. Call (279) 300-1690 for a free estimate with a written, line-item price. No vague ranges, no open-ended allowances you discover at the end.
We Also Serve Cities Near Loomis
We serve Rocklin, Lincoln, Orangevale, and Rancho Cordova from the same scheduling office that covers Loomis. If you’re just outside the town boundary, call us and we’ll confirm your lot’s jurisdiction and what it means for your addition.
Serving Loomis, CA - Our Local Coverage Area
We’re based in the Loomis area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Home Addition Contractor in Loomis
Generally yes, because Placer County Environmental Health requires a capacity check when you add a bedroom or bathroom to a property on septic. The evaluation confirms your leach field can handle the added wastewater load. If it can’t, the addition may require a system upgrade or a different placement for the new room. Call (279) 300-1690 and we’ll explain what your specific lot needs before you commit to a design.
A bedroom addition in a 1980s Loomis home typically triggers AFCI circuit protection on the bedroom circuits, interconnected smoke and CO detectors, and shear wall reinforcement where exterior walls are added or modified. If the existing wiring is ungrounded, the affected circuits may need rewiring to current code. We price these as a pre-approved allowance in your written contract, so the cost is known before we open the wall.
Your bathroom addition must sit a minimum distance from your well head and from any septic tank or leach lines, and that distance is set by Placer County Environmental Health. We survey the well and septic locations before finalizing the addition’s footprint, because moving the addition a few feet is far cheaper than redesigning after a permit denial.
Yes, in many cases we can place a prefab addition from brands like Abodu or Plant Prefab on a Loomis lot, provided the septic review and well setbacks are cleared first. Prefab can shorten on-site time, but the permit path through Placer County doesn’t change. We’ve worked with Cover, Dvele, and Mighty Buildings units and can give you a realistic comparison of prefab versus stick-built for your specific lot.
The most common reason is opening a wall and finding code-triggered issues the previous quote ignored: ungrounded wiring, dry-rotted sill plates from a failed deck ledger, missing fire blocking, or undersized headers. We handle this with a pre-priced allowance written into your contract. When we find something, we stop, document it, and get your written approval before any additional work begins, so you never get a surprise bill at the end.
Written by Miles Hartwell, Owner at Sutton ADU Sacramento, serving Loomis since 2006.
